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OPA837IDBVT Datasheet(PDF) 36 Page - Texas Instruments

Part # OPA837IDBVT
Description  OPAx837 Low-Power, Precision, 105-MHz, Voltage-Feedback Op Amp
PDF  64 Pages
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Manufacturer  TI2 [Texas Instruments]
Direct Link  https://www.ti.com
Logo TI2 - Texas Instruments

OPA837IDBVT Datasheet(HTML) 36 Page - Texas Instruments

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F
G
2R
G = 1 +
R
±
æ
ö
´ ç
÷
±
è
ø
F
IN
CM
G
2R
V
= V
1 +
+ V
OUT
R
GV
SIG-
V
IN-
V
SIG-
V
SIG+
V
CM
V
CM
R
G
R
F
R
F
V
IN+
V
OUT-
V
OUT+
V
CM
V
CM
GV
SIG+
OPA837
½
OPA837
½
36
OPA837, OPA2837
SBOS673D – SEPTEMBER 2017 – REVISED DECEMBER 2018
www.ti.com
Product Folder Links: OPA837 OPA2837
Submit Documentation Feedback
Copyright © 2017–2018, Texas Instruments Incorporated
8.1.8 Differential-to-Differential Amplifier
Figure 79 shows a differential amplifier that is used to amplify differential signals to a differential output. This
circuit has high input impedance and is used in differential line driver applications where the signal source is a
high-impedance driver (for example, a differential DAC) that must drive a line.
Figure 79. Differential-to-Differential Amplifier
The output of the amplifier can be calculated according to Equation 11 if VIN± is set to VCM + VSIG±.
(11)
The signal gain of the circuit is shown in Equation 12, and VCM passes with unity gain. The amplifier combines
two noninverting amplifiers into one differential amplifier that shares the RG resistor, which makes RG effectively
half its value when calculating the gain. The output signals are in-phase with the input signals.
(12)



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